Machine for wrapping loaves of bread



Jan. 14, 1930. P. GANGLER 1,743,565

MACHINE FOR WRAPPING LOAVES OF BREAD Filed June 16, 1927 4 Sheets-Sheet1 PAUL GANG LEK INV ENTOR;

Jan. 14, 1930. P. GANGLER MACHINE FOR WRAPPING LQAVES OF BREAD 4Sheets-Sheet 2 Filed June 16 1927 mvawrqm Attahwy.

SW NMY Jan. 14, 1930. P. GANGLER IACHINB FOR WRAPPING LOAVES OF BREAD 4Sheets-Sheet 3 Filed June 16. 1927 P L GA GLERL #{VENTOFR Jan. 14, 1930.P. GANGLER mourns FOR- WRAPPING LOAVES 0F BREAD Filed June 16, 1927 4Sheets-Sheet Paul Ganglar INVENTOIC Patented Jan. 14, 1 930 UNITEDSTATES PATENT OFFICE,

PA'UIi GANGiLER, 0F ESSLIN'GEN, GERMANY, ASSIGNOR TO THE FIRM FR.HESSER, MASCHINENFAIBRIK-AKTIENGESELLSCHAFT, 0F STUTTGART-CANNSTATT,GERMANY MACHINE FOR WRAPPING LOAVES OF BREAD Application filed June 16,1927, serial No. 199.252. and in Germany April 19, 1926.

My invention relates to machines for wrapping loaves of bread orarticles of similar irregular shape in wrapping sheets of ordinary orwaxed paper, and more particularly to wrapping machines of that type inwhich for the purpose of closing the front flaps of the wrapper theseflaps are twisted together by rotating tongs or grippers.

The object of my invention is to provide a reliably operating wrappingmachine, which is simple in construction and operation and producesmentor and clearer packages than are obtained by known machines.

An embodiment of my invention is illustrated in theaccompanyingdrawings, the machine shown being intended for wrapping uploaves of bread.

In the drawings is:

Fig. 1, a diagrammatic plan of the general arrangement of the machine,

Fig. 2, a side-elevation of the essential parts of the machine,

Fig. 3, a front-elevation viewed from the left of a twisting deviceaccording to Fig. 2 for twisting the ends of the wrapper,

Fig. 4, a planet :1. pair of twisting tongs together with a wrappertwisted at the ends,

Fig. 5 is an enlarged longitudinal sectional view through the bearingsand through the device for shifting of the twisting device shown in theleft side of Fig. 3. Fig. 6 is a front view from the left side of Fig.5., Fig. 7 is a cross section taken on lines AB of Fig. 5, looking inthe direction of the arrows. Fig. 8 is a view of the frame whichsupports the bearing of the twisting device.

Like parts are indicated by like letters and numerals of reference inall the figures of the drawings.

Referring to the drawings, it will be observed that the loavesof bread Bare introduced into the machine, in a well-known manner, upon a lowerfeed track by means of two adjacent intermittently propelled conveyorchains 52 provided with driving members 51 engaging the loaves at theback until they reach a spring-controlled stop 53 pivoted at 56 to themachine frame and an elevating plunger or platform 1. The intermittentdrive of the conveyor chain 52 is effected by any known and thereforenot illustrated suitable 'drivii'ig device from the main driving shaft Ajournalcd in suitable bearings of the machine framing. Said shaft A maybe continuously rotated by means of the pulley 300, intermediate pulleys305, 306 and belts 308, 308), Fig. 1, from the pulley 307 of an electricmotor M. The elevating plunger 1 is adapted to be reciprocatedvertically so that it raises the leaf from the position I-into theposition-II, Fig. 2, opposite to an upper feeding track 103.

The raising and lowering of the elevating plunger lisefi'ectcd inthemanner well-known in conjunction with suchmachines from the main drivingshaft A by means of eccentric and levers. Above the leaf located in theposition I, a Wrapper to be folded around the loaf is placed uponsuitably bent Wires 54 and 55 which are pivoted at 56 and 57 andmaintained in the horizontal position illustrated in Fig. 2 of thedrawings by suitable springs not shown.

I may use cut-to-size Wrappers for the loaves, in which case thewrappers or sheets are stacked in a pile and individual wrappers fed tothe wires 54 and 55 by suitable means, none of this mechanism beingillustrated in the drawings as it is well-known in the art, or I may usea paper web P drawn continuously from a reel (not shown) by means of apair of rollers, also not shown. From this pair of rollers the .Web ofpaper passes on to a second pair of rollers indicated at 39, 40 in Fig.2 of the drawings, and of which the roller 39 is continuously rotated bymeans of a sprocket wheel 62 and chain 63 from a suitable sprocket wheelof the main driving shaft A, and the roller 40 is rotated by frictionalcontact with the roller 39. 7

Every time the front end of the paper web P has been fed forward by therollers 35), 40 past the hereinafter described severing device and on tothe wires 54 and 55 by a length which corresponds with the requiredlength of the wrapping sheet, the Web is clamped in position by aholding-down rail 42 upon the support 200 in known manner and cut oil bythe cutting or severing device. This consists, in. a well known manner,ina fixed knife 41 A and an upand down reciprocatin knife 41',

vide'd at two levers 41; an upwardly extending finger like Frolon ation41 at the one end of the kni e 41 eing connected to a spring 41', whichkeeps it in permanent touch with the stationary knife 41. The levers 41are fixed to a shaft 41, which rests in bearings in the machine frame.The reciprocating vertical movements of the knife 41 is afiected in thewell known manner by a suitable eccentric disposed on the driving shaftA and the arm 41', which is fixed on the shaft 41 and connectin rod 41".The holdin rail 42 does not re ease the front end of the paper web,until the elevating lunger 1 has com leted an ascent and a escent. Thehol ing-down rail 42 is mounted upon an arm 66 pivoted at which in knownmanner is operated and controlled by means of the connecting rod 67 andan eccentric from the main driving shaft A, in a well-known manner.

When the loaf is raised b the elevating plun er 1 from the position Tinto the position I, it turns the two wrapper supporting wires 54, 55upwards and sideways and carries the severed sheet of paper uBwards,whereu on the sheet is folded in -sha e about t e bread B by foldingplates 4 an 6 located at theupper end and sideways to the verticaltrack.

The folding plate 6 is also designed as a reci rocating folding slide.Reciprocatin motionis imparted to the plate 6 by means 0 a rack 76, thepinions 78 and 79 mounted upon the shaft. 77 and the toothed quadrant 80mounted at the u per end of a bell-crank lever 82 which is pivoted at 81and the other arm of which is engaged by the rod 83 which is moved andcontrolled in a well known manner not illustrated, but comprisingintermediate levers from a suitable eccentric mounted on the drivinshaft A.

Above the fol ing slide 6, there is located a second slide 3 adapted tobe operated by .means of arack .spur wheels 201 and 71 and a, toothedquad rant 72 mounted at the upper end of a lever 74 pivoted at 73, theother arm of which is adapted to be oscillated bymeans of the rod andconnecting levers from an eccentric of the shaft A in wellknown manner,for the purpose of oscillating the quadrant 74.

Opposite the slides 6 and 3 and adjoining the olding plate 4 extends theupper feed track 103 upon which the bread is carried forward towards theleft.

When the bread with the paper wrapping folded over is raised into theupper position II in the manner described, the slide 3 is b itsdescribed driving device moved towar s the left by-such a distance thatthe bread with its left-hand side, which is in Fig. Qindicated pingprojecting downwards against the un-.-

derside of the loaf Ii and supports the latter. Now the stop 5 is raisedby a mechanism g which will be hereafter described, and the bread ismoved towards the left by a further advance of the slide 3 intotheposition III in which the loaf encounters an angular stop 9 which likethe angle 5 and by means of the same operating mechanism is able toperform a vertical reciprocating movement. The described step-wisemovement of the slide 3 is effected in the well known manner by thecircumferential shape of the above mentioned drivin eccentric which bymeans of the describe connecting links and gear, controls and operatesthe slide 3.

The angles 5 and 9 are mounted upon a common rail 7 which is raised andlowered by a parallel motion. This parallel motion is composed by twodouble-armed levers 8' and 8' ivoted at 84 and 85 and engagin at 86 an87 e es 88 and 89 of the rail 7, an

connectin ro 90. .Theraisingand lowering.

of the rai 7 is effected and controlled by an arm91 fixed upon the bolt85 and kept with an antifriction roller 301 in eng ement with aneccentric upon a shaft 16 which is in the mannerhereinafter describedcontinuously rotated from the driving shaft A. y

In the position III,--the bread with the frontends U of the wrappingstill open at both sides has reached the center line of twisting deviceslocated at both sides of the feed track 103. Each of these twistingdevices consists of a pair of ton s composed of two grippers or jaws.100. hese grippers are adapted to be closed for theurpose of engagingthe open wrapper ends a and to be rotated in the closed position inunison for the purpose of twisting the ripped ends of the wrapper andalso to be a vanced towards each other in accordance with the shorteningof the ends of the wrapper caused by the twisting whereupon they releasethe twisted ends of the wrapper after the bread has been wrapped u Toenab e the broad ends of the wrapper being mounted upon rotatablyjournaled bolts 1 with the end of the rotary shaft 104 designed asdouble-sided racks 250 in order to effect the closing of the tongsduring their forward motion towards the ends U of the wrappings and theopening of the tongs during their return motion.

The forward and backward motion is imparted to the tongs by a slideblock105 which serves for journaling the said spindles 101 of the tongs andis so arranged upon the rotary shaft 104 by means of a key 107 engagingthe longitudinal groove 106 of the block 105, that the said block 105participates in the rotation but is free to slide axially along theshaft 104. In an annular groove of the block 105 there is provided arotatable ring 108 with pins 109 at both sides engaged by the bifurcatedends 110 of a lever 111 journaled at 112 in arms 113 of the pedestal 114and which is kept in engagement with the operating face of a pot-shapedeccentric 117 of the shaft 16 with an anti-friction bowl 116 by means ofsprings 115 engaging the pins 109.

The rotation of the shaft 104 and thus of the slideblock 105 withthetwisting tongs takes place by means of a spur-wheel 120 keyed upon thesaid shaft 104 which is journaled in the bearing 118 of the pedestal119.

The spur-wheel 120 gears with a spur-wheel 121 adapted to rotatetogether with an adjacent spur-wheel 122 rigidly connected with thewheel 121 upon a pivot pin 251 mounted upon the above mentioned pedestal114. The

drive of the spur-wheel 122 takes place by means of a spur-wheel123mounted upon the above mentioned shaft 16 by means of a key 132 securedto the shaft and with which a corresponding keyway made in the wheel 123engages so that the said wheel 123 is obliged to take part in therotation of the shaft 16 but may together with the pedestal 114 beaxially displaced upon the shaft 16 in the manner hereinafter described.The spurwheels are enclosed in a casing 124 mounted upon the pedestal114. In the same manner as the spur-wheel 123 the eccentric 117mentioned aboveis coupled with the driving shaft 16 by means ofthe key132. The eccentric 117 thus rotates with the said shaft but is free toslide upon'it axially, so that it may also together with the pedestal114 he reciprocated upon the shaft 16.

Around the tapered rear end 104' of the shaft 104 which is journaled inthe bearing 118 rotatably as well as longitudinally slideable, a spring253 is stretched between a collar 130 fixed upon the end 104 and the cap131 screwed upon the bearing 118, said spring 233 having the tendency tomaintain the shaft 104 in its rearposition shown in Fig. 3. The drivingshaft 16 is journaled in the bearings 125 of the pedestals 126 andcontinuously rotated by means of a sprocket wheel 138 from the sprocketwheel 202 of the driving shaft A by means of a chain 203 which is passedover the sprocket wheels 202, 252, 138 and 205. The sprocket wheel 252serves for stretching the chain and is mounted upon an arm 206 pivotedupon a bolt 204 and adapted to be adjusted in various positions upon themachine framing 209 by means of the slot 207 and screw 208 for thepurpose of stretching the chain. The shaft 16'is at its left-hand sideend in Fig. 3 secured against lateral displacement by the said sprocketWheel 138 keyed to it and an outer fixed collar 139 at the intermediatebearing 125 of the pedestal 126.

The two bearing pedestals 126 of the shaft 16 are with their feet 126fixed upon the supports 133 which are with their flanges 133 secured tothe machine frames 209 and 209', as particularly clearly shown in Figs.2 and 5 to 7 of the drawings. The two twisting mechanisms are ontheother hand adjustable in the direction of the longitudinal axis of v thesaid driving shaft 16 in order to enable the spacing of the twistingmechanisms to be adapted to different lengths of loaves. For thispurpose the pedestals 114 and 119 together with the other parts of thetwisting devices are mounted upon slides 134, Figs. 2 and 5 to 7. The.frame 114 consists in one solid piece together with the slide 134,whereas the frame 119 is fastened to the slide 134 by means of screws.The slide 134 is slidably guided in dovetail guides 133 of the frames133, which are provided with prolongations 133 (Figs. 5,7 and 8)extending through excavations 209' of the lateral frames 209 and 209'towards the inside, so as to produce along guiding track. The slides 134ride with guide nuts 137 upon the end screw-threads 140 and 140 of aguide screw 136 which is journaled in bearings 220, but is securedagainst lateral displacement by collars 221. One screw 140 is providedwith right-hand screw-thread and the other screw 140 with left-handscrew thread, so that by turning the spindle 136 by means of thehandwheel 135 the supports or slides 134 with the twisting mechanismsattached to them can be caused to approach or to recede from each other.The apparatus operates in the following manner:

When the bread reaches the position III.

the slide-block upon the shaft 104, which .U" of the wrapping, so thatthey grip it between them and twist it together in the manner shown inFig. 4. As soon as the tongs 100 have closed, the rotary shaft 104 ismoved forward against the resistance of the spring 253 during thefurther advance of the slide- ,tion to each other.

block 105 by means of the engagement of the toothed sectors 102 with theracks 250, so that the tongs'100 also advance in correspondence with theshortening of the wrapper end U due to its twisting so that theshortening of the wrapping is taken into account by the tongs. W en thelever 111 is swung back again by its cooperation vwith the eccentric 117the shaft 104 is pulled back into its initial position by the spring 253and the grippers or tongs 100 are opened again.

The stops'5, 9 are now raised and the next loaf is moved forward intothe position 111, whereupon the sto s 5 and 9 are lowered again as soonas the loaf as assed below them during its advance. By t is advance, theloaves already wrap ed u .are also'advanced alon the upper feed track103 and reach at the en of the track a conveyor belt 210 which passesaround the pulley 211 and a; second pulley not shown. The drive isefi'ected by means of the pulley 211 'keyled to the shaft 212 which isJournaled in t e side frames of the'machine and'continuously rotated inthe direction of the arrow by the above mentioned sprocket wheel 205which is also keyed to the shaft 212.

Various changes and modifications may be made in the details of theinvention without departing from its s irit, and I desire, therefore,that only such limitations shall be placed thereon as are imposed by theprior art.

I claim as my invention:

- 1. In a wrapping machinecf the type described havin means for placinga wrapper in the shape 0 a tube around an article, means located at eachfront end of the article comprising a twisting mechanism for twisti theends of the wrapper progecting beyon the articles at the ends, anseparate drivin means for each twisting mechanism, ai twistingmechanisms and their separate rivin means being mounted as a unit inmovable soc ets adapte to be reciprocated with re1a 2. In a wrappingmachine ofithe type de-- scribed havin means for placing a wrapper inthe shape 0 a tube around an article means located at each front end ofthe article com prising a twisting mechanism for twistin the ends of thewrapper, projectin beyon the article at the ends, and separate rivingmeans for each twisting mechanism, said twisting mechanisms and their searate driving means being mounted as a unit in slidably guided sockets,ide nuts upon said supports and a rotata 1e uide spindle withinverselythreaded on s upon which said nuts are adapted to be screwed in oppositedirections.

3. In a wrapping machine of the type described having means for placinga wrapper in the shape of a tube around an article and at each front endof said article,

nuance per tongs pivoted upon a sleevelike b 00 means between said shaftmounted for reative axial movement within said block, slidably guidedsockets for the twistinginechanisms, separate means comprising aneccentric and a lever controlled by it for moving each slide-blockforward and backward on said rotary shaft for closing and opening therespective gripper tongs by means of said engaging-means between thegrippers and the shaft, separate driving wheels for rotating said rotaryshafts of the twisting mechanisms, a driving shaft common to bothtwisting mechanisms and rotatable in bearings of said sockets, and meansfor displacing said sockets of the twisting mechanisms axially to saidcommon driving shaft, said eccentrics and said driving wheels beinglocated upon the sockets of the twisting mechanisms and axially slidablycoupled with the common driving shaft. 7

In testimony whereof I have, afiixed my 51 grippers and a rotary

